Rounding & Estimating Sums

Front

What is rounding?

Back

Rounding is the process of adjusting a number to make it simpler and easier to work with, usually to the nearest ten, hundred, or other place value.

Front

What does it mean to estimate?

Back

Estimating means finding a number that is close enough to the exact amount, often used to make calculations easier.

Front

How do you round a number to the nearest ten?

Back

Look at the digit in the ones place. If it is 5 or more, round up. If it is 4 or less, round down.

Front

What is the nearest ten for the number 52?

Back

50

Front

Estimate the sum of 118 and 189 by rounding to the nearest hundred.

Back

$100 + $200 = $300$

Front

How do you find the difference between two numbers using estimation?

Back

Round each number to the nearest ten or hundred, then subtract the rounded numbers.

Front

Estimate how many more fourth graders were on a field trip than fifth graders if there were 237 fifth graders and 346 fourth graders.

Back

100 more

Front

What is the estimated total of 32 minutes and 16 minutes?

Back

50 minutes

Front

What is the process of estimating a sum?

Back

Round each number to a convenient value, then add the rounded numbers together.

Front

If you have 488 and 351, what is the estimated difference when rounded to the nearest ten?

Back

140